Mu Wan Yu, carrying her household registration book, ran away from home, only to witness her fiancé's passionate affair with her best friend... Heartbroken, a billionaire CEO heroically appeared... and added fuel to the fire! He took her household registration book and tricked her into the civil affairs bureau! Unable to become the Jiang family's daughter-in-law, she transformed into a sister-in-law. With a powerful backer, she happily abused the scumbag and decisively trampled the evil woman! But when his deepest secrets are revealed layer by layer, loving his wife like his life? It's just a joke...